Why do you think some americans supported imperialism

Imperialism is a way in which the country is controlled by the use of either military forces or by an emperor. Americans have been in the support of imperialism since a long time especially in the nineteenth century.

People in America thought that it is needed to increase the trade and develop more by setting up new markets for it's goods and this could be done by increasing it's influence on the world through this policy.

the answer for 3 is b and the answer for 4 is d